Horseshoe-calk



J. 0. NYGAARD.

HORSESHOE CALK. APPLICATION FILED mums. 1920.

Patented Sept. 20,1921.

hammered into its place.

UNITED STATES JOHAN OLSEN NYGAARD, OF GI-IRISTIANIA, NORWAY.

HORSESHOE-CALK.

Application filed March 23, 1920.

To all to hem it may concern Be it known that I, JOHAN OLSEN NY- GAARD, a subject of the King of Norway, residing at Christiania, Norway, have invented certain new and useful Improve ments in Horseshoe-Calks (for which Ihave filed an application in Norway Sept. 20, 1918, application N 0. 14,441) and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The present invention relates .to horseshoes and has for its object a frost nail or calk, which may easily. be fastened in the horseshoe, and which is-securely held in position without loosening. V

According to the invention the frost nail is fastened in a corresponding boring or recess in the horseshoe by means of a wedge member, the wedging action of which acts in the longitudinal direction of the horseshoe, 2'. c., parallel to the direction of movement.

The frost nail may suitably consist of two parts between the adjacent surfaces of which the wedge is driven after the parts have been placed in the horseshoe, said adjacent surfaces being perpendicular to the dime,

tion of movement. The frost nail may even consist of one piece, the wedge being driven in between one end surface of this piece and the adjacent surface of the bore into which the nail is fitted. It is preferred to let the wedge project a little below the surface of the frost nail, so that the wedge is constantly The wedge member may also suitably be manufactured from harder material than the frost nail itself, so that it will always project outside the frost nail as the same is gradually worn off.

In the drawings Figure l is a longitudi- Specification of Letters Patent.

Patented Sept. 20, 1921. Serial No. 368,183.

nal section through one form of the invention.

Fig. 2 is a front view of the same, and Fig. 8 illustrates the same as seen from below Fig. 4 is a longitudinal section through another form of the invention.

Fig. 5 is a front view of the same, and Fig. 6 illustrates the same as seen from below. 7

In Fig. l a is a frost nail dovetailed as indicated at g which is fitted into a hole in the horseshoe c fastened to the hoof d. A wedge Z) is driven in between the end surface of nail a and the adjacent surface of its fastening hole. As it will be seen the wedge surfaces are perpendicular to the direction of movement, which is indicated by the arrow in Fig. 3. The wedge is provided with a hole or recess 7 for facilitating or call: slightly the extraction of the same.

In Fig. 4 the nail or call: consists of two parts a, a, the wedge 6 being driven in be tween the same. The wedge is provided with projections c at both sides servingto facilitate its extraction.

Claim:

A horseshoe having a cavity formed therein, a calk formed of two parts each having a dovetailed tenon to conform to the walls of the cavity, the two parts being-perpendicular to the di rection of posed between said said wedge acting in tion and parallel to ment, said wedge having lateral projections extending beyond the sides of the call: to facilitate extraction of the wedge.

V In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

J OHAN OLSEN N YGAARD.

Witnesses:

NATH. A. HEDMSOHON, S. HAMPTON DE Pun.

surfaces, the force of the longitudinal directhe adjacent opposing surfaces of movement, and a wedge interthe direction of 'move- 

